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Related Concept Videos

Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...
The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
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Action Potentials01:41

Action Potentials

Overview

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Related Experiment Video

Updated: Jul 5, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
10:08

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Published on: December 9, 2022

Coincident pre- and postsynaptic activity downregulates NKCC1 to hyperpolarize E(Cl) during development.

Trevor Balena1, Melanie A Woodin

  • 1Department of Cell & Systems Biology, University of Toronto, Toronto, Ontario, Canada.

The European Journal of Neuroscience
|April 24, 2008
PubMed
Summary

Coincident neuronal activity strengthens GABAergic inhibition in immature brains by modulating chloride transport. This ionic plasticity enhances inhibitory synaptic function through the NKCC1 cotransporter.

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Mature CNS inhibition relies on KCC2, where coincident activity weakens GABAergic synapses.
  • Immature CNS synapses maintain high intracellular chloride via NKCC1, influencing GABAergic function.

Purpose of the Study:

  • Investigate how coincident pre- and postsynaptic activity modulates immature GABAergic synapses.
  • Determine the role of NKCC1 in activity-dependent chloride dynamics and synaptic inhibition.

Main Methods:

  • Dual perforated patch-clamp recordings from cultured rat hippocampal neurons.
  • Identified GABAergic synapses with specific chloride reversal potentials (ECl).
  • Utilized bumetanide to block NKCC1 and furosemide as a KCC2 antagonist.

Main Results:

  • Coincident activity induced a hyperpolarizing shift in ECl, strengthening inhibition.
  • Blocking NKCC1 with bumetanide hyperpolarized ECl and prevented activity-induced shifts.
  • Bumetanide's effect occluded further shifts by furosemide, implicating NKCC1 regulation.

Conclusions:

  • Brief coincident activity strengthens immature GABAergic inhibition via NKCC1 regulation.
  • This study demonstrates ionic plasticity as a key mechanism for inhibitory synaptic plasticity.
  • NKCC1 activity is crucial for modulating inhibitory neurotransmission during early development.